Opel GT
Coolant capacity & service interval
The Opel GT coolant specifications cover a capacity range of 4.7 to 6 liters. The data includes two configurations for the model. The fluid type specified is coolant for normal use.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| GT 1.1 (1969-1973) |
|
| GT 1.9 (1969-1973) |
|
Additional Notes
- The Opel GT 1.1 carries a cooling system capacity of 4.7 liters, a figure consistent with the smaller displacement of a 1.1-liter engine requiring less thermal management volume than larger configurations.
- The GT 1.9 cooling system holds 6 liters, reflecting the greater heat output associated with a 1.9-liter engine and the correspondingly larger coolant volume needed to maintain operating temperatures.
- Between the two engine variants spanning 1969-1973, the 1.9 requires approximately 1.3 liters more coolant than the 1.1, a difference that carries practical weight when sourcing the correct premixed or concentrated coolant quantity for a service fill.
- Both the 1.1 and 1.9 capacity figures represent cooling system totals under normal use conditions, meaning the values apply to standard operating environments rather than modified service scenarios.
- A 4.7-liter cooling system, as seen in the GT 1.1, is a relatively modest total capacity, which means even a small coolant loss represents a proportionally significant reduction in the system's ability to regulate engine temperature.